<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        show-icon
        title="注意：只允许为第三级分类设置相关参数"
        type="warning"
        :closable="false"
      ></el-alert>
      <!-- 选择商品分类区域  -->
      <el-row class="cate_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 商品分类级联选择框 -->
          <el-cascader
            v-model="selectedKeys"
            :options="cateList"
            :props="cascaderProps"
            @change="handleCateChanged"
            :clearable="true"
          ></el-cascader>
          <el-tabs v-model="activeName" @tab-click="handleTabClick">
            <el-tab-pane label="动态参数" name="many">
              <!-- 添加动态参数面板 -->
              <el-button
                type="primary"
                size="mini"
                :disabled="isBtnDisabled"
                @click="addDialogVisible = true"
                >添加参数</el-button
              >
              <!-- 动态参数表格 -->
              <el-table :data="manyTableData" border stripe>
                <el-table-column type="expand">
                  <template slot-scope="scope">
                    <!-- 循环遍历attr_vals -->
                    <el-tag
                      v-for="(item, index) in scope.row.attr_vals"
                      :key="index"
                      closable
                      @close="handleClose(index, scope.row)"
                      >{{ item }}</el-tag
                    >
                    <!-- 添加文本框 与 按钮的切换-->
                    <el-input
                      class="input-new-tag"
                      v-if="scope.row.inputVisible"
                      v-model="scope.row.inputValue"
                      ref="saveTagInput"
                      size="small"
                      @keyup.enter.native="handleInputConfirm(scope.row)"
                      @blur="handleInputConfirm(scope.row)"
                    >
                    </el-input>
                    <el-button
                      v-else
                      class="button-new-tag"
                      size="small"
                      @click="showInput(scope.row)"
                      >+ New Tag</el-button
                    >
                  </template>
                </el-table-column>
                <el-table-column type="index"></el-table-column>
                <el-table-column
                  label="参数名称"
                  prop="attr_name"
                ></el-table-column>
                <el-table-column label="操作">
                  <template slot-scope="scope">
                    <el-button
                      size="mini"
                      type="primary"
                      icon="el-icon-edit"
                      @click="showEditDialog(scope.row.attr_id)"
                      >编辑</el-button
                    >
                    <el-button
                      size="mini"
                      type="danger"
                      icon="el-icon-delete"
                      @click="removeParams(scope.row.attr_id)"
                      >删除</el-button
                    >
                  </template>
                </el-table-column>
              </el-table>
            </el-tab-pane>
            <el-tab-pane label="静态属性" name="only">
              <!-- 添加静态属性面板 -->
              <el-button
                type="primary"
                size="mini"
                :disabled="isBtnDisabled"
                @click="addDialogVisible = true"
                >添加属性</el-button
              >
              <!-- 静态属性表格 -->
              <el-table :data="onlyTableData" border stripe>
                <el-table-column type="expand">
                  <template slot-scope="scope">
                    <!-- 循环遍历attr_vals -->
                    <el-tag
                      v-for="(item, index) in scope.row.attr_vals"
                      :key="index"
                      closable
                      @close="handleClose(index, scope.row)"
                      >{{ item }}</el-tag
                    >
                    <!-- 添加文本框 与 按钮的切换-->
                    <el-input
                      class="input-new-tag"
                      v-if="scope.row.inputVisible"
                      v-model="scope.row.inputValue"
                      ref="saveTagInput"
                      size="small"
                      @keyup.enter.native="handleInputConfirm(scope.row)"
                      @blur="handleInputConfirm(scope.row)"
                    >
                    </el-input>
                    <el-button
                      v-else
                      class="button-new-tag"
                      size="small"
                      @click="showInput(scope.row)"
                      >+ New Tag</el-button
                    >
                  </template>
                </el-table-column>
                <el-table-column type="index"></el-table-column>
                <el-table-column
                  label="属性名称"
                  prop="attr_name"
                ></el-table-column>
                <el-table-column label="操作">
                  <template slot-scope="scope">
                    <el-button
                      size="mini"
                      type="primary"
                      icon="el-icon-edit"
                      @click="showEditDialog(scope.row.attr_id)"
                      >编辑</el-button
                    >
                    <el-button
                      size="mini"
                      type="danger"
                      icon="el-icon-delete"
                      @click="removeParams(scope.row.attr_id)"
                      >删除</el-button
                    >
                  </template>
                </el-table-column>
              </el-table>
            </el-tab-pane>
          </el-tabs>
        </el-col>
      </el-row>
    </el-card>
    <!-- 添加参数或属性对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加参数的对话框 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 修改的对话框 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类
      cateList: [],
      // 指定联级选择器的配置对象
      cascaderProps: {
        expandTrigger: "hover",
        value: "cat_id",
        label: "cat_name",
        children: "children"
      },
      //   级联选择框双向绑定到的数组
      selectedKeys: [],
      //   被激活的页签的名称
      activeName: "many",
      //   动态参数数据
      manyTableData: [],
      //   静态属性的数据
      onlyTableData: [],
      //   添加对话框的显示
      addDialogVisible: false,
      //   添加参数的表单数据对象
      addForm: {
        attr_name: ""
      },
      //   添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" }
        ]
      },
      //   控制修改对话框的显示与隐藏
      editDialogVisible: false,
      //   修改表单的数据对象
      editForm: {},
      //   修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" }
        ]
      }
    };
  },
  created() {
    this.getCateList();
  },
  //   计算属性
  computed: {
    //   如果按钮需要被禁用 则返回True 否则返回flase
    isBtnDisabled() {
      if (this.selectedKeys.length !== 3) {
        return true;
      }
      return false;
    },
    // 当前选中的三级分类的ID
    cateId() {
      if (this.selectedKeys.length === 3) {
        return this.selectedKeys[2];
      }
      return null;
    },
    // 动态显示模态框标题的文本
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      } else {
        return "静态属性";
      }
    }
  },
  methods: {
    //   获取所有商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败！");
      }

      this.cateList = res.data;
      //   console.log(this.cateList);
    },
    // 级联选择框选中项变化时会触发
    handleCateChanged() {
      this.getParamsData();
    },
    // Tab页签点击事件的处理函数
    handleTabClick() {
      this.getParamsData();
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedKeys.length !== 3) {
        this.selectedKeys = [];
        this.manyTableData = [];
        this.onlyTableData = [];
        return;
      }
      //   根据所有分类的ID 和所属的面板获取对应的数据
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName }
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数列表失败");
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : [];
        // 控制文本框的显示与隐藏
        item.inputVisible = false;
        // 文本框中输入的值
        item.inputValue = "";
      });
      if (this.activeName === "many") {
        this.manyTableData = res.data;
      } else {
        this.onlyTableData = res.data;
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    // 点击按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return;
        }
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        );
        if (res.meta.status !== 201) {
          return this.$message.error("添加参数失败!");
        }
        this.$message.success("添加参数成功！");
        this.addDialogVisible = false;
        this.getParamsData();
      });
    },
    // 点击编辑按钮 添加对话框
    async showEditDialog(attr_id) {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        {
          params: { attr_sel: this.activeName }
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数信息失败");
      }
      this.editForm = res.data;
      this.editDialogVisible = true;
    },
    // 监听修改对话框的关闭事件 重置表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    // 点击修改对话框确定按钮
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) {
          return;
        }
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("修改参数失败！");
        }

        this.$message.success("修改成功");
        this.getParamsData();
        this.editDialogVisible = false;
      });
    },
    // 根据ID删除对应参数项
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning"
        }
      ).catch(err => err);
      if (confirmResult !== "confirm") {
        return this.$message.info("已取消删除参数");
      }
      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      );
      if (res.meta.status !== 200) {
        return this.$message.error("删除参数失败");
      }
      this.$message.success("删除成功");
      this.getParamsData();
    },
    // 文本框市区焦点 或者摁下了enter 都会触发
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = "";
        row.inputVisible = false;
        return;
      }
      // 如果没有return 则证明输入的内容需要做后续的处理
      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = "";
      row.inputVisible = false;
      this.saveAttrVals(row);
    },
    // 点击按钮 展示文本输入框
    showInput(row) {
      row.inputVisible = true;
      // 文本框自动获得焦点
      // $nextTick 方法的作用 就是当页面上元素被重新渲染之后 财会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    // 将对attr_vals的操作 保存到数据库
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(" ")
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("修改参数项失败");
      }
      this.$message.success("修改参数项成功");
    },
    // 删除对应的参数可选项
    handleClose(index, row) {
      row.attr_vals.splice(index, 1);
      this.saveAttrVals(row);
    }
  }
};
</script>

<style lang="less" scoped>
.cate_opt {
  margin: 15px 0px;
}
.el-cascader {
  width: 20%;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>
